An alarm device for power communication failure information analysis comprises an alarm parameter setting unit, an alarm threat analysis comparing unit, a main control module, an alarm module, a device alarm event acquisition module and an alarm data external interface module, wherein an output end of the device alarm event acquisition module is connected to an input end of an alarm threat rating unit, output ends of the alarm parameter setting unit and the alarm threat analysis comparing unit are connected with an input end of the main control module, an output end of the main control module is connected to an input end of the alarm module, and data of the main control module and the alarm module are provided for external equipment or external devices through the alarm data external interface module. In communication networks with characteristics of power operation systems, the alarm device is capable of self-adaptively processing alarm information of the equipment, performing risk analysis to power communication networks and improving reliability of communication systems.